Issues 1179 and 1182 (#1232)

* Update logging

* Remove duplicate code

* Update unit tests

* Clean up includes

* Merge ProtobufSerializer into protobuf_util namespace

* Precompile regex

* Add const

* Add Split() convenience method, update log level/ID parsing

* Move log.h to legacy folder

* Elimininate gotos

* Fixes for gcc 13

* Update compiler flags

* Update default folder handling

* Use references instead of pointers

* Move code for better encapsulation

* Move code

* Remove unused method argument

* Move device logger

* Remove redundant to_string

* Rename for consistency

* Update handling of protobuf pointers

* Simplify protobuf usage

* Memory handling update

* Add hasher

cpp/shared/network_util.cpp

@@ -0,0 +1,75 @@
+//---------------------------------------------------------------------------
+//
+// SCSI Target Emulator PiSCSI
+// for Raspberry Pi
+//
+// Copyright (C) 2023 Uwe Seimet
+//
+//---------------------------------------------------------------------------
+
+#include "network_util.h"
+#include <cstring>
+#include <ifaddrs.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <unistd.h>
+
+using namespace std;
+
+bool network_util::IsInterfaceUp(const string& interface)
+{
+	ifreq ifr = {};
+    strncpy(ifr.ifr_name, interface.c_str(), IFNAMSIZ - 1); //NOSONAR Using strncpy is safe
+	const int fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
+
+	if (!ioctl(fd, SIOCGIFFLAGS, &ifr) && (ifr.ifr_flags & IFF_UP)) {
+	    close(fd);
+    	return true;
+    }
+
+    close(fd);
+    return false;
+}
+
+set<string, less<>> network_util::GetNetworkInterfaces()
+{
+	set<string, less<>> network_interfaces;
+
+#ifdef __linux__
+	ifaddrs *addrs;
+	getifaddrs(&addrs);
+	ifaddrs *tmp = addrs;
+
+	while (tmp) {
+    	if (const string name = tmp->ifa_name; tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET &&
+    		name != "lo" && name != "piscsi_bridge" && !name.starts_with("dummy") && IsInterfaceUp(name)) {
+    		// Only list interfaces that are up
+    		network_interfaces.insert(name);
+	    }
+
+	    tmp = tmp->ifa_next;
+	}
+
+	freeifaddrs(addrs);
+#endif
+
+	return network_interfaces;
+}
+
+bool network_util::ResolveHostName(const string& host, sockaddr_in *addr)
+{
+	addrinfo hints = {};
+	hints.ai_family = AF_INET;
+	hints.ai_socktype = SOCK_STREAM;
+
+	if (addrinfo *result; !getaddrinfo(host.c_str(), nullptr, &hints, &result)) {
+		*addr = *reinterpret_cast<sockaddr_in *>(result->ai_addr); //NOSONAR bit_cast is not supported by the bullseye compiler
+		freeaddrinfo(result);
+		return true;
+	}
+
+	return false;
+}